Specifications

APPLICATION DATA (cont)
CHANGE IN INDOOR UNIT PISTON SIZE
FOR ELEVATION
OUTDOOR UNIT ABOVE INDOOR UNIT
Ft Piston Change
0-25 0
26-50 -3
51-75 -5
76-100 -7
101-125 -9
126-150 -10
I NDOOR UNIT ABOVE OUTDOOR UNIT
Ft Piston Change
0-25 0
26-65 +4
CHANGE IN OUTDOOR UNIT PISTON SIZE
FOR ELEVATION
OUTDOOR UNIT ABOVE INDOOR UNIT
Ft Piston Change
0-50 0
51-75 +4
76-100 +6
101-125 +8
126-150 +10
OUTDOOR UNIT BELOW INDOOR UNIT
Ft Piston Change
0-65 0
(f) Liquid line solenoid and tubing configuration — The
solenoid has a flow arrow stamped on the valve body.
When the valve is closed (not energized) and pressure
is applied in the direction of the flow arrow, complete
shut off will occur. If pressure is applied against the
direction of the arrow, leakage through the valve will
occur. When determining the proper location for a
solenoid in a system liquid line, consider both flow
direction in heating mode and location of the valve in
the system. See the diagram at right for proper loca-
tion, and install as follows:
Horizontal configuration (see figure at above right) —
• Install a biflow liquid line solenoid valve within 2 ft of
the outdoor unit with the flow arrow pointing toward
the heat pump unit if equivalent ft of piping is 100 ft
or more.
• Slope the vapor line toward the indoor unit to pro-
vide for refrigerant migration protection during the off
cycle due to temperature differences caused by
slight elevation changes between indoor and out-
door units.
NOTE: When installing a liquid line solenoid, a low-
voltage transformer may be required.
Elevated configuration — Indoor unit installed above
the outdoor unit (see figure at right):
• A biflow solenoid valve is required in the liquid line
within 2 ft of the heat pump unit with the arrow point-
ing toward the heat pump unit.
• The maximum elevation difference is 65 ft (16 ft for
high wall systems using 619E009,012), and the
maximum equivalent ft of piping is 200 ft (35 ft for
high wall systems using 619E009,012).
• Install an inverted trap in the vapor line. The top of
the trap must be above the top of the fan coil. This
prevents the refrigerant from collecting in the vapor
line.
• If there is over 25 ft of lift, a solenoid valve is re-
quired in the liquid line.
Lowered configuration — Indoor unit installed below
the outdoor unit (see figure on page 69):
• For lines with less than 25 ft of lift, no solenoid valve
is required in the liquid line. For lines with over 25 ft
of lift, install a biflow solenoid valve in the liquid line
within 2 ft of the heat pump unit with the arrow point-
ing toward the heat pump unit.
• The maximum elevation difference is 150 ft (30 ft for
high-wall systems using 619E009,012), and the
maximum equivalent ft is 200 ft (35 ft for high-wall
systems using 619E009,012).
(g) Additional charge — The unit should be charged by
weighing in the appropriate charge. Add charge based
on the actual length of line which is over 25 ft of liquid
line. Add 0.58 oz of refrigerant per 1 ft increase over
the 25 ft line to the charge listed in Piston Guide tables
on page 67.
LEGEND
FCU — Fan Coil Unit
OU — Outdoor Unit
LEGEND
OU — Outdoor Unit
FCU — Fan Coil Unit
Solenoid Valve
(Required)
*High wall systems using 619E009,012.
†Ceiling suspended and in-ceiling cas-
sette systems and high wall systems
using 619E018,024.
NOTE: Pumping liquid up compensates for pressure drop by using
a larger piston size at FCU.
*High wall systems using 619E009,012.
†Ceiling suspended and in-ceiling cas-
sette systems, and high wall systems
using 619E018,024.
Horizontal Configuration
Elevated Configuration — Indoor Unit
Installed Above the Outdoor Unit
68